https://www.reddit.com/r/Bitcoin/comments/94r41n/satoshi_did_not_propose_the_21_million_setsupply/?utm_source=share&utm_medium=android_app&utm_name=androidcss&utm_term=1&utm_content=share_button

This threads pretty good. Starts as claiming Satoshi didn't come up with the 21m hardcap, then Peter Wuille (BIP42 author) drops in to set the record straight.